US20170146583A1 - Multi-phase turn-on blanking time with vbatt-based fault threshold voltage - Google Patents
Multi-phase turn-on blanking time with vbatt-based fault threshold voltage Download PDFInfo
- Publication number
- US20170146583A1 US20170146583A1 US14/946,405 US201514946405A US2017146583A1 US 20170146583 A1 US20170146583 A1 US 20170146583A1 US 201514946405 A US201514946405 A US 201514946405A US 2017146583 A1 US2017146583 A1 US 2017146583A1
- Authority
- US
- United States
- Prior art keywords
- reference voltage
- output
- voltage
- signal
- driver
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
-
- G01R31/025—
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/3644—Constructional arrangements
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/093—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current with timing means
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
- H03K17/082—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit
- H03K17/0822—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit in field-effect transistor switches
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/58—Testing of lines, cables or conductors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/0027—Measuring means of, e.g. currents through or voltages across the switch
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/0036—Means reducing energy consumption
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/0072—Low side switches, i.e. the lower potential [DC] or neutral wire [AC] being directly connected to the switch and not via the load
Definitions
- the present disclosure relates to electronic power systems, and more particularly to electronic controller fault detection.
- a low-side (LS) pre-driver for short-circuit-to-battery (SCB)/overcurrent fault detection scheme includes a single-phase turn-on blanking time and a fault threshold voltage or a reference voltage based on either 5V or 3.3V.
- the resultant blank time at the threshold voltage extends for a long period, approximately 25 ⁇ sec for avoiding false SCB default detection, such that the potential peak power at the MOSFET is upwards to 825W. Therefore, the MOSFET is sized to handle the SCB default detection power instead of being sized to handle the non-default operation of the LS pre-driver.
- a low-side (LS) output pre-driver having a short-circuit-to-battery fault detection scheme for a MOSFET switch having a drain connection to a load connected to a battery voltage and a source connection tied to ground is provided.
- the LS output pre-driver includes a comparator, a reference voltage selector, a multi-phase blank/filter, and a multi-phase control timer.
- the comparator has a first input, a second input, and an output.
- the first input of the comparator is configured to receive a voltage indicative of the voltage at the drain connection.
- the reference voltage selector configured to output one of a plurality of reference voltage signals to the second input of the comparator.
- the multi-phase blank/filter having an input connection and an output connection.
- the multi-phase blank/filter is configured to blank an incoming signal received from the comparator output during a plurality of time intervals.
- the multi-phase control timer having a first timer output connection and a second timer output connection.
- the first timer output connection is configured to send a first signal to the reference voltage selector and the second timer output connection is configured to send a second signal to the multi-phase blank/filter.
- the first signal of the multi-phase control timer instructs the reference voltage selector to select which of the plurality of reference voltage signals is provided to the second input of the comparator.
- the second signal of the multi-phase control timer instructs the multi-phase blank/filter to change from one of the plurality of time intervals to another of the plurality of time intervals.
- each of the plurality of reference voltage signals is a percentage of the maximum of the battery voltage and a predetermined limit voltage.
- the predetermined limit voltage is 12 volts.
- the plurality of reference voltage signals includes a first, a second, and a third reference voltage signal.
- the plurality of reference voltage signals are obtained by a plurality of voltage divider circuits fed from a common voltage source.
- the plurality of time intervals includes a first time interval, a second time interval, and a third time interval.
- the first time interval is about 12 ⁇ sec
- the second time interval is about 12 ⁇ sec
- the third time interval is about 10 ⁇ sec.
- the reference voltage selector further includes seven resistors, a Zener diode, and a selector, and wherein the first reference voltage signal is approximately 7% of battery voltage, the second voltage signal is approximately 50% of battery voltage, and the third reference voltage is approximately 92% of battery voltage.
- FIG. 1 is a schematic diagram of a low-side output pre-driver having short-circuit-to-battery fault detection, in accordance with an embodiment of the present invention
- FIG. 2 is plot showing LS output drain voltage as a function of time, in accordance with an embodiment of the present invention.
- FIG. 3 is plot showing peak power during a short-circuit-to-battery fault as a function of time, in accordance with an embodiment of the present invention.
- FIG. 1 an electronic schematic for a low-side (LS) output pre-driver 10 for a switch 12 is illustrated and will now be described.
- the LS pre-driver 10 includes an amplifier 14 , a comparator 16 , a multi-phase blank/filter 18 , a reference voltage selector 22 , and a multi-phase control timer 24 . More specifically, a battery voltage (VBATT) 26 is coupled to the reference voltage selector 22 and powers the comparator 16 .
- the LS output pre-driver 10 is coupled to the switch 12 via a first or drain connection 70 , a second or gate connection 72 , and a third or source connection 74 .
- the amplifier 14 of the LS output pre-driver 10 buffers and/or amplifies the voltage difference between the drain connection 70 and the source connection 74 .
- the voltage from the amplifier 14 is compared to the reference voltage of the reference voltage selector 22 .
- the output of the comparator 16 is coupled to the multi-phase blank/filter 18 .
- the reference voltage selector 22 is capable of providing at least three different reference voltages to the comparator 16 .
- the reference voltage selector 22 includes a first through seventh resistors 28 , 30 , 32 , 34 , 36 , 76 , 78 , a first Zener diode 38 , and a selector 40 .
- the first resistor 28 is a 2K ⁇ resistor configured to provide bias current to the Zener diode 38 .
- the voltage selector circuit 22 is configured to provide a reference voltage VREF to a plurality of voltage dividers.
- the reference voltage VREF is limited to the Zener voltage (12 volts in the embodiment shown) for battery voltage VBATT in excess of the Zener voltage.
- a first voltage divider circuit comprises resistor 30 (40K ⁇ in the embodiment shown) in series with the resistor 32 (3K ⁇ in the embodiment shown), to produce a voltage at node 42 equal to VREF * 3/43, or approximately 7% of VREF with the resistor values shown.
- a second voltage divider circuit comprises resistor 76 (40K ⁇ in the embodiment shown) in series with resistor 34 (40K ⁇ in the embodiment shown), to produce a voltage at node 44 equal to VREF * 40/80, or 50% of VREF with the resistor values shown.
- a third voltage divider circuit comprises resistor 78 (40K ⁇ in the embodiment shown) in series with resistor 36 (440K ⁇ in the embodiment shown), to produce a voltage at node 46 equal to VREF * 440/480, or approximately 92% of VREF.
- the selector 40 is depicted as a switch whose common connection, i.e. the node connected input 48 of comparator 16 , can be selectively connected to one of the three voltage divider output voltages 42 , 44 , 46 .Each of the first, second, and third voltage divider nodes 42 , 44 , 44 is selectively coupled with a reference voltage input 48 of the comparator 16 .
- a first reference voltage (1 st Vth_fault) is selected.
- a second reference voltage (2 nd Vth_fault) is selected.
- a third reference voltage (3 rd Vth fault) is selected.
- the multi-phase control timer 24 provides a signal to the selector 40 for selecting, for example, the first node 42 or first reference voltage (1 st Vth_fault) the second node 44 or second reference voltage (2 nd Vth_fault) or the third node 46 or third reference voltage (3 rd Vth_fault).
- the multi-phase control timer 24 also provides a signal to the multi-phase blank/filter 18 .
- the signal from the multi-phase control timer 24 provides a blanking interval during which the multi-phase blank/filter 18 inhibits the fault detection signal from the comparator 16 .
- the multi-phase blank/filter 18 may inhibit the comparator 16 fault signal at multiple instances for a specific duration of each instance.
- a first blank time is 12 ⁇ sec
- a second blank time is 12 ⁇ sec
- a third blank time is 10 ⁇ sec.
- the comparator 16 fault signal is blocked from reaching a receiver of the SCB/Overcurrent fault detection signal.
- the first blank time is coupled with the first reference voltage (1 st Vth_fault) such that if the actual LS output drain voltage is larger than the first reference voltage (1st Vth_fault) as the first blank time expires, the SCB/Overcurrent fault is detected.
- the switch 12 includes an N-channel MOSFET 50 , a first, second, and third resistors 52 , 54 , 56 , a waveform clipper 58 , and a first and second capacitor 66 , 68 .
- the MOSFET 50 includes a drain 60 , a gate 62 , and a source 64 .
- the drain 60 and source 64 are coupled as inputs to the amplifier 14 of the LS output pre-driver 10 .
- the waveform clipper 58 is coupled in parallel with the MOSFET 50 between the gate 62 and the drain 60 .
- the first resistor 52 is coupled in parallel with the MOSFET 50 between the source 64 and the gate 62 and is a 47K resistor.
- the second resistor 54 is coupled in series with the gate 62 and is a 1K resistor.
- the third resistor 56 and the first capacitor 66 are coupled together in series and are further coupled in parallel with the MOSFET 50 between the gate 62 and the drain 60 .
- the third resistor 56 is a 47K resistor while the first capacitor 66 is a 470 pF capacitor.
- the second capacitor 68 is a 10 nF capacitor and grounds the drain 60 .
- FIG. 2 shows the operation of the LS pre-driver 10 using drain voltage (V) vs. Time ( ⁇ sec) at various levels of battery voltage VBATT during normal operation, i.e. in the absence of a short-circuit-to-battery (SCB) condition.
- VBATT may range from Low VBATT (about 9V) to High VBATT (about 16V) with Nominal VBATT at about 12V.
- One of the benefits of the present invention is having the flexibility of pegging the reference voltage as a percentage of VBATT instead of a predetermined reference voltage.
- the reference voltage selector 22 automatically adjusts each of the first, second, and third reference voltages when VBATT is less than 12V. If VBATT is above 12V, the reference voltages remain at the same voltages as if VBATT was 12V.
- the multi-phase blank/filter 18 and reference voltage selector 22 also enable the low-side (LS) output pre-driver 10 and switch 12 to use a slow slew-rate setting across the entire battery voltage VBATT 86 range without triggering a false SCB fault thus improving the reliability and accuracy of the fault detection scheme.
- the low-side pre-driver 10 turns on the switch 12 at the time indicated as 10 ⁇ sec on the x-axis 80 .
- EMC electromagnetic compatibility
- the drain voltage 84 takes in excess of 20 ⁇ sec after the turn-on time to get below 1 volt. If 1 volt was used as a threshold voltage to recognize a SCB condition and if the blanking time was accordingly set to exceed 20 ⁇ sec, in the presence of a SCB condition the switch 12 would have to conduct the high short-circuit current until the blanking interval expired and the pre-driver 10 called for the switch to turn off. During this blanking interval high power dissipation in the switch would occur, and the MOSFET would have to be sized to dissipate this power without damage.
- Power (W) 90 dissipated in the MOSFET 50 is shown in the presence of a SCB fault.
- the MOSFET 50 can be turned off at the moment SCB fault is detected after the first blank time 92 .
- peak power 94 reached at the time of SCB fault detection is 405W based on 15V and 27A.
- peak power can approach 825W (based on 15V and 55A) before the single phase blank timer expires. Since the peak power possible on the present example is less than half the previous scheme, the MOSFET 50 can be resized to a smaller MOSFET 50 .
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electronic Switches (AREA)
- Protection Of Static Devices (AREA)
Abstract
Description
- The present disclosure relates to electronic power systems, and more particularly to electronic controller fault detection.
- The statements in this section merely provide background information related to the present disclosure and may or may not constitute prior art.
- A low-side (LS) pre-driver for short-circuit-to-battery (SCB)/overcurrent fault detection scheme includes a single-phase turn-on blanking time and a fault threshold voltage or a reference voltage based on either 5V or 3.3V. The resultant blank time at the threshold voltage extends for a long period, approximately 25 μsec for avoiding false SCB default detection, such that the potential peak power at the MOSFET is upwards to 825W. Therefore, the MOSFET is sized to handle the SCB default detection power instead of being sized to handle the non-default operation of the LS pre-driver.
- While current SCB fault detection schemes perform as designed, there is room in the art for improved SCB fault detection schemes that exhibit improved performance and enable further design possibilities to improve cost, reliability, and performance.
- A low-side (LS) output pre-driver having a short-circuit-to-battery fault detection scheme for a MOSFET switch having a drain connection to a load connected to a battery voltage and a source connection tied to ground is provided. The LS output pre-driver includes a comparator, a reference voltage selector, a multi-phase blank/filter, and a multi-phase control timer. The comparator has a first input, a second input, and an output. The first input of the comparator is configured to receive a voltage indicative of the voltage at the drain connection. The reference voltage selector configured to output one of a plurality of reference voltage signals to the second input of the comparator. The multi-phase blank/filter having an input connection and an output connection. The multi-phase blank/filter is configured to blank an incoming signal received from the comparator output during a plurality of time intervals. The multi-phase control timer having a first timer output connection and a second timer output connection. The first timer output connection is configured to send a first signal to the reference voltage selector and the second timer output connection is configured to send a second signal to the multi-phase blank/filter. The first signal of the multi-phase control timer instructs the reference voltage selector to select which of the plurality of reference voltage signals is provided to the second input of the comparator. The second signal of the multi-phase control timer instructs the multi-phase blank/filter to change from one of the plurality of time intervals to another of the plurality of time intervals.
- In another example of the present invention, each of the plurality of reference voltage signals is a percentage of the maximum of the battery voltage and a predetermined limit voltage.
- In yet another example of the present invention, the predetermined limit voltage is 12 volts.
- In yet another example of the present invention, the plurality of reference voltage signals includes a first, a second, and a third reference voltage signal.
- In yet another example of the present invention, the plurality of reference voltage signals are obtained by a plurality of voltage divider circuits fed from a common voltage source.
- In yet another example of the present invention, the plurality of time intervals includes a first time interval, a second time interval, and a third time interval.
- In yet another example of the present invention, the first time interval is about 12 μsec, the second time interval is about 12 μsec, and the third time interval is about 10 μsec.
- In yet another example of the present invention, the reference voltage selector further includes seven resistors, a Zener diode, and a selector, and wherein the first reference voltage signal is approximately 7% of battery voltage, the second voltage signal is approximately 50% of battery voltage, and the third reference voltage is approximately 92% of battery voltage.
- Further areas of applicability will become apparent from the description provided herein. It should be understood that the description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure.
- The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way.
-
FIG. 1 is a schematic diagram of a low-side output pre-driver having short-circuit-to-battery fault detection, in accordance with an embodiment of the present invention; -
FIG. 2 is plot showing LS output drain voltage as a function of time, in accordance with an embodiment of the present invention; and -
FIG. 3 is plot showing peak power during a short-circuit-to-battery fault as a function of time, in accordance with an embodiment of the present invention. - The following description is merely exemplary in nature and is not intended to limit the present disclosure, application, or uses.
- Referring to the drawings, wherein like reference numbers refer to like components, in
FIG. 1 an electronic schematic for a low-side (LS) output pre-driver 10 for aswitch 12 is illustrated and will now be described. The LS pre-driver 10 includes anamplifier 14, acomparator 16, a multi-phase blank/filter 18, areference voltage selector 22, and amulti-phase control timer 24. More specifically, a battery voltage (VBATT) 26 is coupled to thereference voltage selector 22 and powers thecomparator 16. The LS output pre-driver 10 is coupled to theswitch 12 via a first ordrain connection 70, a second orgate connection 72, and a third orsource connection 74. - The
amplifier 14 of the LS output pre-driver 10 buffers and/or amplifies the voltage difference between thedrain connection 70 and thesource connection 74. The voltage from theamplifier 14 is compared to the reference voltage of thereference voltage selector 22. The output of thecomparator 16 is coupled to the multi-phase blank/filter 18. - The
reference voltage selector 22 is capable of providing at least three different reference voltages to thecomparator 16. Thereference voltage selector 22 includes a first throughseventh resistors diode 38, and aselector 40. In the example shown inFIG. 1 , thefirst resistor 28 is a 2KΩ resistor configured to provide bias current to the Zenerdiode 38. Thevoltage selector circuit 22 is configured to provide a reference voltage VREF to a plurality of voltage dividers. The reference voltage VREF is limited to the Zener voltage (12 volts in the embodiment shown) for battery voltage VBATT in excess of the Zener voltage. For a battery voltage value VBATT less than the Zener voltage, the reference voltage VREF is essentially equal to the battery voltage VBATT. A first voltage divider circuit comprises resistor 30 (40KΩ in the embodiment shown) in series with the resistor 32 (3KΩ in the embodiment shown), to produce a voltage atnode 42 equal to VREF * 3/43, or approximately 7% of VREF with the resistor values shown. A second voltage divider circuit comprises resistor 76 (40KΩ in the embodiment shown) in series with resistor 34 (40KΩ in the embodiment shown), to produce a voltage atnode 44 equal to VREF * 40/80, or 50% of VREF with the resistor values shown. A third voltage divider circuit comprises resistor 78 (40KΩ in the embodiment shown) in series with resistor 36 (440KΩ in the embodiment shown), to produce a voltage atnode 46 equal to VREF * 440/480, or approximately 92% of VREF. - The
selector 40 is depicted as a switch whose common connection, i.e. the node connectedinput 48 ofcomparator 16, can be selectively connected to one of the three voltagedivider output voltages voltage divider nodes reference voltage input 48 of thecomparator 16. When thereference voltage input 48 of thecomparator 16 is coupled with thefirst node 42, a first reference voltage (1st Vth_fault) is selected. When thereference voltage input 48 of thecomparator 16 is coupled with thesecond node 44, a second reference voltage (2nd Vth_fault) is selected. When thereference voltage input 48 of thecomparator 16 is coupled with thethird node 46, a third reference voltage (3rd Vth fault) is selected. - The
multi-phase control timer 24 provides a signal to theselector 40 for selecting, for example, thefirst node 42 or first reference voltage (1st Vth_fault) thesecond node 44 or second reference voltage (2nd Vth_fault) or thethird node 46 or third reference voltage (3rd Vth_fault). - The
multi-phase control timer 24 also provides a signal to the multi-phase blank/filter 18. The signal from themulti-phase control timer 24 provides a blanking interval during which the multi-phase blank/filter 18 inhibits the fault detection signal from thecomparator 16. For example, the multi-phase blank/filter 18 may inhibit thecomparator 16 fault signal at multiple instances for a specific duration of each instance. In the present embodiment, a first blank time is 12 μsec, a second blank time is 12 μsec, and a third blank time is 10 μsec. During each of the blank times, thecomparator 16 fault signal is blocked from reaching a receiver of the SCB/Overcurrent fault detection signal. Furthermore, when combined with thereference voltage selector 22 the first blank time is coupled with the first reference voltage (1st Vth_fault) such that if the actual LS output drain voltage is larger than the first reference voltage (1st Vth_fault) as the first blank time expires, the SCB/Overcurrent fault is detected. - The
switch 12 includes an N-channel MOSFET 50, a first, second, andthird resistors waveform clipper 58, and a first andsecond capacitor MOSFET 50 includes adrain 60, agate 62, and asource 64. Thedrain 60 andsource 64 are coupled as inputs to theamplifier 14 of theLS output pre-driver 10. Thewaveform clipper 58 is coupled in parallel with theMOSFET 50 between thegate 62 and thedrain 60. Thefirst resistor 52 is coupled in parallel with theMOSFET 50 between thesource 64 and thegate 62 and is a 47K resistor. The second resistor 54 is coupled in series with thegate 62 and is a 1K resistor. Thethird resistor 56 and thefirst capacitor 66 are coupled together in series and are further coupled in parallel with theMOSFET 50 between thegate 62 and thedrain 60. Thethird resistor 56 is a 47K resistor while thefirst capacitor 66 is a 470 pF capacitor. Thesecond capacitor 68 is a 10 nF capacitor and grounds thedrain 60. - Referring now to
FIGS. 2 and 3 , charts demonstrating the operation of the low-side (LS)output pre-driver 10 and switch 12 are illustrated and will now be described.FIG. 2 shows the operation of theLS pre-driver 10 using drain voltage (V) vs. Time (μsec) at various levels of battery voltage VBATT during normal operation, i.e. in the absence of a short-circuit-to-battery (SCB) condition. VBATT may range from Low VBATT (about 9V) to High VBATT (about 16V) with Nominal VBATT at about 12V. One of the benefits of the present invention is having the flexibility of pegging the reference voltage as a percentage of VBATT instead of a predetermined reference voltage. Thus thereference voltage selector 22 automatically adjusts each of the first, second, and third reference voltages when VBATT is less than 12V. If VBATT is above 12V, the reference voltages remain at the same voltages as if VBATT was 12V. - The multi-phase blank/
filter 18 andreference voltage selector 22 also enable the low-side (LS)output pre-driver 10 and switch 12 to use a slow slew-rate setting across the entirebattery voltage VBATT 86 range without triggering a false SCB fault thus improving the reliability and accuracy of the fault detection scheme. InFIG. 2 , the low-side pre-driver 10 turns on theswitch 12 at the time indicated as 10 μsec on thex-axis 80. In order to improve electromagnetic compatibility (EMC) performance of the circuit, theslew rate 82 of the drain voltage during the turn-on transient is limited to not exceed approximately 0.7 V/μsec. Because theslew rate 82 of the drain voltage is limited, checking for a SCB condition must be delayed to avoid triggering a false positive fault condition during the turn-on transient. As shown inFIG. 2 , under normal operation thedrain voltage 84 takes in excess of 20 μsec after the turn-on time to get below 1 volt. If 1 volt was used as a threshold voltage to recognize a SCB condition and if the blanking time was accordingly set to exceed 20 μsec, in the presence of a SCB condition theswitch 12 would have to conduct the high short-circuit current until the blanking interval expired and the pre-driver 10 called for the switch to turn off. During this blanking interval high power dissipation in the switch would occur, and the MOSFET would have to be sized to dissipate this power without damage. - As shown in
FIG. 3 , Power (W) 90 dissipated in theMOSFET 50 is shown in the presence of a SCB fault. With the fault detection circuit of the present invention, theMOSFET 50 can be turned off at the moment SCB fault is detected after the firstblank time 92. In the present example,peak power 94 reached at the time of SCB fault detection is 405W based on 15V and 27A. In contrast, with a single phase, predetermined reference voltage default detection scheme with a fault threshold of 1 volt and a blank time of 25 μsec, peak power can approach 825W (based on 15V and 55A) before the single phase blank timer expires. Since the peak power possible on the present example is less than half the previous scheme, theMOSFET 50 can be resized to asmaller MOSFET 50. - The description of the invention is merely exemplary in nature and variations that do not depart from the gist of the invention are intended to be within the scope of the invention. Such variations are not to be regarded as a departure from the spirit and scope of the invention.
Claims (20)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/946,405 US9733296B2 (en) | 2015-11-19 | 2015-11-19 | Multi-phase turn-on blanking time with VBATT-based fault threshold voltage |
PCT/US2016/050176 WO2017087049A1 (en) | 2015-11-19 | 2016-09-02 | Multi-phase turn-on blanking time with vbatt- based fault threshold voltage |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/946,405 US9733296B2 (en) | 2015-11-19 | 2015-11-19 | Multi-phase turn-on blanking time with VBATT-based fault threshold voltage |
Publications (2)
Publication Number | Publication Date |
---|---|
US20170146583A1 true US20170146583A1 (en) | 2017-05-25 |
US9733296B2 US9733296B2 (en) | 2017-08-15 |
Family
ID=56926341
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/946,405 Active US9733296B2 (en) | 2015-11-19 | 2015-11-19 | Multi-phase turn-on blanking time with VBATT-based fault threshold voltage |
Country Status (2)
Country | Link |
---|---|
US (1) | US9733296B2 (en) |
WO (1) | WO2017087049A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20180045783A1 (en) * | 2016-08-12 | 2018-02-15 | General Electric Company | Solid state circuit breaker and motor driving system |
US11329475B2 (en) * | 2020-08-06 | 2022-05-10 | Lite-On Electronics (Guangzhou) Limited | Multi-level over-current protection circuit |
US11797036B2 (en) * | 2018-11-30 | 2023-10-24 | Xi'an Zhongxing New Software Co., Ltd. | Detection and protection circuit, power supply circuit, power supply method of active device |
EP4287510A1 (en) * | 2022-06-02 | 2023-12-06 | Airbus S.A.S. | Overcurrent protection circuit for fast switching semiconductors, and method of protecting fast switching semiconductors from overcurrents |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110161338B (en) * | 2019-05-30 | 2021-08-03 | 中国舰船研究设计中心 | Test method for electromagnetic compatibility time domain management between active and passive electronic systems |
US11150300B2 (en) | 2019-12-16 | 2021-10-19 | Analog Devices International Unlimited Company | Adaptive blanking of over current fault detection circuits in power conversion gate drivers |
Citations (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4322641A (en) * | 1979-12-11 | 1982-03-30 | Packburn Electronics | Noise reduction system |
US5063931A (en) * | 1990-11-05 | 1991-11-12 | Hewlett-Packard Company | Method and apparatus for signal dependent gain control |
US5933012A (en) * | 1995-09-14 | 1999-08-03 | Abb Research Ltd. | Device for sensing of electric discharges in a test object |
US6038516A (en) * | 1998-03-19 | 2000-03-14 | Siemens Energy & Automation, Inc. | Method for graphically displaying a menu for selection and viewing of the load related parameters of a load connected to an AC load control device |
US6172862B1 (en) * | 1999-06-11 | 2001-01-09 | Anthony J. Jonnatti | Partial discharge relay and monitoring device |
US6456511B1 (en) * | 2000-02-17 | 2002-09-24 | Tyco Electronics Corporation | Start-up circuit for flyback converter having secondary pulse width modulation |
US6774639B1 (en) * | 1999-09-02 | 2004-08-10 | Transgrid | Partial discharge monitoring system for transformers |
US20110169423A1 (en) * | 2009-10-15 | 2011-07-14 | Richtek Technology Corporation | Circuit and Method for Controlling Light Emitting Device, and Integrated Circuit Therefor |
US8067988B2 (en) * | 2009-02-20 | 2011-11-29 | Sunplus Technology Co., Ltd. | Low jitter and wide-range frequency synthesizer for low voltage operation |
US20120062148A1 (en) * | 2010-09-10 | 2012-03-15 | Samsung Electronics Co., Ltd. | Luminescence driving apparatus, display apparatus, and driving method thereof |
US20120119799A1 (en) * | 2010-11-16 | 2012-05-17 | Jiazhou Liu | Wake-up circuit and an on board unit including the same, a filter, methods for frequency detection and filtering |
US20120223722A1 (en) * | 2011-03-02 | 2012-09-06 | Hitachi Vehicle Energy, Ltd. | Voltage Measurement Device and Voltage Measurement System |
US20150330650A1 (en) * | 2014-05-15 | 2015-11-19 | Emerson Electric Co. | Hvac system air filter diagnostics and monitoring |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007074837A1 (en) | 2005-12-26 | 2007-07-05 | Autonetworks Technologies, Ltd. | Power supply control device |
US7948729B2 (en) | 2009-06-29 | 2011-05-24 | Summit Microelectronics, Inc. | Method and circuit for over-current protection |
US20130314836A1 (en) | 2012-05-24 | 2013-11-28 | Allegro Microsystems, Inc. | Transistor Overcurrent Detection |
-
2015
- 2015-11-19 US US14/946,405 patent/US9733296B2/en active Active
-
2016
- 2016-09-02 WO PCT/US2016/050176 patent/WO2017087049A1/en active Application Filing
Patent Citations (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4322641A (en) * | 1979-12-11 | 1982-03-30 | Packburn Electronics | Noise reduction system |
US5063931A (en) * | 1990-11-05 | 1991-11-12 | Hewlett-Packard Company | Method and apparatus for signal dependent gain control |
US5933012A (en) * | 1995-09-14 | 1999-08-03 | Abb Research Ltd. | Device for sensing of electric discharges in a test object |
US6038516A (en) * | 1998-03-19 | 2000-03-14 | Siemens Energy & Automation, Inc. | Method for graphically displaying a menu for selection and viewing of the load related parameters of a load connected to an AC load control device |
US6172862B1 (en) * | 1999-06-11 | 2001-01-09 | Anthony J. Jonnatti | Partial discharge relay and monitoring device |
US6774639B1 (en) * | 1999-09-02 | 2004-08-10 | Transgrid | Partial discharge monitoring system for transformers |
US6456511B1 (en) * | 2000-02-17 | 2002-09-24 | Tyco Electronics Corporation | Start-up circuit for flyback converter having secondary pulse width modulation |
US8067988B2 (en) * | 2009-02-20 | 2011-11-29 | Sunplus Technology Co., Ltd. | Low jitter and wide-range frequency synthesizer for low voltage operation |
US20110169423A1 (en) * | 2009-10-15 | 2011-07-14 | Richtek Technology Corporation | Circuit and Method for Controlling Light Emitting Device, and Integrated Circuit Therefor |
US20120062148A1 (en) * | 2010-09-10 | 2012-03-15 | Samsung Electronics Co., Ltd. | Luminescence driving apparatus, display apparatus, and driving method thereof |
US20120119799A1 (en) * | 2010-11-16 | 2012-05-17 | Jiazhou Liu | Wake-up circuit and an on board unit including the same, a filter, methods for frequency detection and filtering |
US20120223722A1 (en) * | 2011-03-02 | 2012-09-06 | Hitachi Vehicle Energy, Ltd. | Voltage Measurement Device and Voltage Measurement System |
US20150330650A1 (en) * | 2014-05-15 | 2015-11-19 | Emerson Electric Co. | Hvac system air filter diagnostics and monitoring |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20180045783A1 (en) * | 2016-08-12 | 2018-02-15 | General Electric Company | Solid state circuit breaker and motor driving system |
US10591547B2 (en) * | 2016-08-12 | 2020-03-17 | General Elecric Company | Solid state circuit breaker and motor driving system |
US11797036B2 (en) * | 2018-11-30 | 2023-10-24 | Xi'an Zhongxing New Software Co., Ltd. | Detection and protection circuit, power supply circuit, power supply method of active device |
US11329475B2 (en) * | 2020-08-06 | 2022-05-10 | Lite-On Electronics (Guangzhou) Limited | Multi-level over-current protection circuit |
EP4287510A1 (en) * | 2022-06-02 | 2023-12-06 | Airbus S.A.S. | Overcurrent protection circuit for fast switching semiconductors, and method of protecting fast switching semiconductors from overcurrents |
Also Published As
Publication number | Publication date |
---|---|
WO2017087049A1 (en) | 2017-05-26 |
US9733296B2 (en) | 2017-08-15 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US9733296B2 (en) | Multi-phase turn-on blanking time with VBATT-based fault threshold voltage | |
US9490647B2 (en) | Capacitance discharge limiter | |
KR102145165B1 (en) | Switching regulator and electronic apparatus | |
KR102110109B1 (en) | Switching regulator and electronic device | |
US20190363633A1 (en) | Systems and methods for two-level protection of power conversion systems | |
US20170271867A1 (en) | Inrush current prevention circuit | |
US9325168B2 (en) | Semiconductor device | |
TW201320517A (en) | Systems and methods for protecting power conversion systems under open and/or short circuit conditions | |
EP3038223B1 (en) | Load driving circuit | |
KR20160064004A (en) | Dc-dc converter | |
KR20170024005A (en) | Circuit and method for detecting short circuit failure of a switching transistor | |
US20160352319A1 (en) | Drive device | |
US10256805B2 (en) | Protective circuit with current regulating digital output module | |
US20110279941A1 (en) | Half-bridge circuit protected against short circuits and having semiconductor switches | |
US11545972B2 (en) | Overcurrent protection circuit for switching element turned on and off based on control voltage | |
KR101771803B1 (en) | Over-current protection circuit and method | |
US20190201933A1 (en) | Transmitting and receiving device and ultrasound system | |
US10277221B2 (en) | Protection circuit | |
US20180109177A1 (en) | Systems and methods for a dual function inrush limiting circuit | |
EP3306767A1 (en) | A circuit protection arrangement | |
US9490713B2 (en) | Power supply | |
US10170997B2 (en) | Switching power supply apparatus | |
US20170070056A1 (en) | Power control current sharing circuit | |
US11749983B2 (en) | Startup protection circuit, for interrupting startup of a boost DC-DC switching converter | |
US11574902B2 (en) | Clamp for power transistor device |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: CONTINENTAL AUTOMOTIVE SYSTEMS, INC., MICHIGAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BAIK, CHUNG HEUM;GONZALEZ-AMAYA, JORGE;REEL/FRAME:037137/0793 Effective date: 20151118 |
|
STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
|
MAFP | Maintenance fee payment |
Free format text: PAYMENT OF MAINTENANCE FEE, 4TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M1551); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY Year of fee payment: 4 |
|
AS | Assignment |
Owner name: VITESCO TECHNOLOGIES USA, LLC., MICHIGAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CONTINENTAL AUTOMOTIVE SYSTEMS, INC.;REEL/FRAME:057650/0926 Effective date: 20210810 |
|
AS | Assignment |
Owner name: VITESCO TECHNOLOGIES USA, LLC., MICHIGAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CONTINENTAL AUTOMOTIVE SYSTEMS, INC.;REEL/FRAME:058108/0319 Effective date: 20210810 |